Comfortable Holding. Allows natural stretching to reduces fatigue when you use the mouse.Tough Game Performance. PMW-3325 game chip with outstanding game performance delivers quick and sensitive response.On-board Memory. 128KB on-board memory allows to save the set data in the mouse, and to match other computers with no software installed.Unique Structure and Finger Groove. Allows your fingers to stretch and force more evenly and the comfortable finger groove makes the fingers more fit the mouse surface.Five Adjustable DPI. 1500, 2500, 4000, 7000, 10000DPI adjustable, with 4 DPI indicators, for convenient displaying.